remove superfluous include directive
remove superfluous include directive

Summary:folly::fibers does not use folly::MoveWrapper anymore, so no need to
include that header file.

Reviewed By: yfeldblum

Differential Revision: D3169374

fb-gh-sync-id: 2409b46156843fb0a1454b560c42186f1c412988
fbshipit-source-id: 2409b46156843fb0a1454b560c42186f1c412988

Orvid/folly,rklabs/folly,charsyam/folly,brunomorishita/folly,brunomorishita/folly,floxard/folly,mqeizi/folly,floxard/folly,charsyam/folly,facebook/folly,rklabs/folly,brunomorishita/folly,Orvid/folly,facebook/folly,mqeizi/folly,charsyam/folly,Orvid/folly,floxard/folly,brunomorishita/folly,rklabs/folly,facebook/folly,charsyam/folly,floxard/folly,rklabs/folly,facebook/folly,brunomorishita/folly,mqeizi/folly,mqeizi/folly,rklabs/folly,floxard/folly,facebook/folly,mqeizi/folly,Orvid/folly,Orvid/folly